Projection screen

Abstract

Provided is a projection screen used by being attached to an optically transparent adherend. The projection screen includes a transparent base material and a pressure sensitive adhesive layer. The luminance at frontal 0° on the transparent base material side as measured using transmitted light from a white light source of 1100 cd/m2 is 10 cd/m2 or more and 400 cd/m2 or less. The luminance ratio of a luminance at diagonal 45° on the transparent base material side as measured using transmitted light from a white light source of 1100 cd/m2 with respect to the luminance at frontal 0° is 0.5 or more. According to the projection screen, it is possible to achieve both the background visibility when the projector is turned off and the frontal and diagonal visibility when the projector is turned on.

1 . A projection screen used by being attached to an optically transparent adherend, the projection screen comprising:
 a transparent base material; and   a pressure sensitive adhesive layer, wherein   a luminance at frontal 0° on the transparent base material side as measured using transmitted light from a white light source of 1100 cd/m 2  is 10 cd/m 2  or more and 400 cd/m 2  or less, and   a luminance ratio of a luminance at diagonal 45° on the transparent base material side as measured using transmitted light from a white light source of 1100 cd/m 2  with respect to the luminance at frontal 0° is 0.5 or more.   
     
     
         2 . The projection screen according to  claim 1 , wherein the luminance at diagonal 45° on the transparent base material side as measured using the transmitted light from the white light source of 1100 cd/m 2  is 10 cd/m 2  or more and 400 cd/m 2  or less. 
     
     
         3 . The projection screen according to  claim 1 , wherein its haze value is 1.0% or more and 70% or less. 
     
     
         4 . The projection screen according to  claim 1 , wherein its total luminous transmittance is 50% or more. 
     
     
         5 . The projection screen according to  claim 1 , wherein the pressure sensitive adhesive layer is composed of a silicone-based pressure sensitive adhesive composition. 
     
     
         6 . The projection screen according to  claim 1 , wherein a pressure sensitive adhesive composition that constitutes the pressure sensitive adhesive layer contains light-diffusing fine particles. 
     
     
         7 . The projection screen according to  claim 6 , wherein the light-diffusing fine particles are inorganic fine particles. 
     
     
         8 . The projection screen according to  claim 1 , wherein a hard coat layer is provided on a surface of the transparent base material opposite to the pressure sensitive adhesive layer.